a895836321
Split out webrtc-specific #defines from typedefs.h, into rtc_base/annotations.h and rtc_base/arch.h. Also removes the curiously named WEBRTC_CPU_DETECTION #define. BUG=webrtc:6854 Review-Url: https://codereview.webrtc.org/3007253002 Cr-Commit-Position: refs/heads/master@{#19752}
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_RTC_BASE_ANNOTATIONS_H_
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#define WEBRTC_RTC_BASE_ANNOTATIONS_H_
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// Annotate a function indicating the caller must examine the return value.
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// Use like:
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// int foo() RTC_WARN_UNUSED_RESULT;
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// To explicitly ignore a result, cast to void.
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// TODO(kwiberg): Remove when we can use [[nodiscard]] from C++17.
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#if defined(__clang__)
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#define RTC_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
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#elif defined(__GNUC__)
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// gcc has a __warn_unused_result__ attribute, but you can't quiet it by
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// casting to void, so we don't use it.
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#define RTC_WARN_UNUSED_RESULT
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#else
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#define RTC_WARN_UNUSED_RESULT
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#endif
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// Macro to be used for switch-case fallthrough (required for enabling
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// -Wimplicit-fallthrough warning on Clang).
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#if defined(__clang__)
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#define RTC_FALLTHROUGH() [[clang::fallthrough]]
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#else
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#define RTC_FALLTHROUGH() do { } while (0)
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#endif
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// Prevent the compiler from warning about an unused variable. For example:
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// int result = DoSomething();
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// assert(result == 17);
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// RTC_UNUSED(result);
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// Note: In most cases it is better to remove the unused variable rather than
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// suppressing the compiler warning.
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#define RTC_UNUSED(x) static_cast<void>(x)
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#endif // WEBRTC_RTC_BASE_ANNOTATIONS_H_
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